ISSN:
1572-9605
Schlagwort(e):
High-temperature superconductivity
;
superconducting gap
;
phonons
;
reflectivity spectra
;
alloys
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Elektrotechnik, Elektronik, Nachrichtentechnik
,
Physik
Notizen:
Abstract We report a reflectivity study of thez-polarized TO-phonons of Pr x Y1−x Ba2Cu4O8 and YBa2−y Sr y Cu4O8 alloys in the temperature range 10–300 K. Anomalies of the frequency and linewidth of the plane-oxygen vibration atω∼300 cm−1 due to the opening of the superconducting gap are found to occur upon crossing the superconducting transition temperatureT c . Phonon self-energy effects are strongly dependent onT c , providing evidence for a relative shift of the gap with respect to the energy of phonon.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00730379
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